For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

Vehicle Care
California Proposition 65 WarningRemoval Procedure
Warning: Refer to Cracked Window Warning in the Preface section.
Warning: Refer to Glass and Sheet Metal Handling Warning in the Preface section
Note: Position the vehicle on level ground and move the front
wheels to the straight-ahead position.
Disconnect battery.
Remove air inlet grill ...
Windshield Washer Pump Seal Replacement
Removal Procedure
Open the hood.
Remove the windshield washer pump. Refer to Windshield Washer Pump
Replacement
Using a small flat-bladed tool, remove the washer pump terminal seal (1)
from the washer solvent container (2).
Installation Procedure
Position the washer pump ...
Global Positioning System (GPS)
The position of the vehicle is determined by using satellite signals, various
vehicle signals, and map data.
At times, other interference such as the satellite condition, road configuration,
condition of the vehicle, and/or other circumstances can affect the navigation system's
ability to ...